October 7, 196s r,-pDialkylparaconic acids (111) were synthesized by hydrolysis of r,- pdialkyl-a, p-dicarbethoxybutyrolac-tones (IV), or by means of lactonization of the Stobbe half-esters (IX). The butyrolactones (IV) were obtained by the condensation of ethyl@- dialkylglycidates (V) with sodiomalonate. Treatment of the paraconic acids (111) with polyphosphoric acid gave the corresponding 2, 3-dialkyl-2-cyclopenten-l-ones (I), ...
